CN115519724B - Microbubble injection molding device with clout is retrieved - Google Patents
Microbubble injection molding device with clout is retrieved Download PDFInfo
- Publication number
- CN115519724B CN115519724B CN202210752712.3A CN202210752712A CN115519724B CN 115519724 B CN115519724 B CN 115519724B CN 202210752712 A CN202210752712 A CN 202210752712A CN 115519724 B CN115519724 B CN 115519724B
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- CN
- China
- Prior art keywords
- inlet
- cavity
- channel
- injection molding
- nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 description 19
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 238000005187 foaming Methods 0.000 description 8
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
- B29C44/424—Details of machines
- B29C44/425—Valve or nozzle constructions; Details of injection devices
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a microbubble injection molding device with residual material recovery, which comprises a main body, wherein the main body is communicated with a cavity of a mold, and the microbubble injection molding device also comprises an overflow recovery device, a third channel is arranged on the main body, the third channel is communicated with the cavity and the overflow recovery device, the third channel is generally in a closed state, after injection molding is finished, the third channel is opened, and raw materials in the cavity enter the overflow recovery device through the third channel under the action of pressure and are discharged by the overflow recovery device for recovery.
Description
Technical Field
The invention relates to a foaming injection molding device, in particular to a micro-foaming injection molding device with residual material recycling function.
Background
Applicant is in an earlier patent: CN201611018907.6 discloses a SCF mixer, in which supercritical fluid (SCF) is added to plastics to homogenize them, then injected into a mold cavity, and the supercritical fluid is converted into a gaseous state due to the sudden drop in pressure, so that micro bubbles are formed in the plastics, and thus the amount of plastics used in injection molding can be reduced, which is equivalent to reducing the cost of the product.
However, this device has a disadvantage that the material liquid cannot escape after being injected into the cavity, and the space in the cavity is insufficient, which affects the foaming rate of the product.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the micro-bubble injection molding device with the function of recycling the excess materials, which can recycle the return materials in the cavity and enable the foaming to be more sufficient.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a microbubble injection molding device with clout is retrieved, includes the main part, the main part with the die cavity of mould communicates with each other, still includes an overflow recovery unit, be provided with the third passageway in the main part, the third passageway intercommunication die cavity and overflow recovery unit, the third passageway is in the off-state generally, after the injection molding is accomplished, the third passageway is opened, the raw materials in the die cavity is under the effect of pressure through the third passageway enters into in the overflow recovery unit, and by overflow recovery unit discharges and retrieves.
In the above technical scheme, preferably, the overflow recovery device comprises a barrel and a screw, the screw is arranged in the barrel, the screw is driven to rotate by a driving device, and the barrel is communicated with the third channel.
In the above technical scheme, preferably, the gun barrel and the body are provided with heating devices,
In the above technical scheme, preferably, one end of the main body is connected with the flange through the connector, a reversing valve, a mixer and a cavity are arranged in the main body, a needle valve is arranged in the cavity, a nozzle is arranged at the end part of the cavity, the nozzle is sleeved on the outer ring of the needle valve, the outer ring of the nozzle is contacted with the inner wall of the cavity, a valve core and a follow-up sleeve are arranged in the needle valve, a first channel is formed in a gap between the inner wall of the cavity and the inner core, a second channel is formed in the gap between the needle valve and the inner core, the follow-up sleeve is in sliding connection with the front end of the needle valve, the valve core passes through the follow-up sleeve, a baffle is arranged on the outer ring of the nozzle, the baffle is fixed at the end part of the main body, the inner ring of the baffle is in sliding connection with an overflow sleeve, the end part of the baffle is tightly propped against under the action of a spring, the end part of the overflow sleeve is provided with an opening, in a normal state, the nozzle is positioned in the overflow sleeve, when the spring is compressed, the nozzle is connected with the inlet, the nozzle is further connected with the inlet, the inlet is further connected with the inlet, and the inlet is connected with the inlet.
In the above technical scheme, preferably, the mixer comprises an inner cavity, a mixing shaft arranged in the inner cavity and an inflatable plug communicated with the inner wall of the inner cavity, wherein the mixing shaft is connected with the driving device through a chain wheel.
The beneficial effects of the invention are as follows: after the overflow recovery device is added, the material injected into the die can be extruded out of the device under the action of the internal pressure, so that the foaming rate of the inside of the product is greatly improved, the product is lighter, and the material is saved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an enlarged partial schematic view of fig. 1.
Fig. 3 is a schematic view of the initial state of the present invention.
FIG. 4 is a schematic representation of the invention when injection molding a masterbatch.
FIG. 5 is a schematic representation of the invention when injecting a mix.
FIG. 6 is a schematic diagram of the invention during overflow recovery.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
Referring to fig. 1-2, a micro-foaming injection molding device with residual material recovery comprises a main body 1 and an overflow recovery device 2, wherein one end of the main body 1 is connected with a flange 12 through a connector 11, and a reversing valve 3, a mixer 4 and a chamber 13 are arranged in the main body 1.
The mixer 4 comprises an inner cavity 41, a mixing shaft 42 arranged in the inner cavity 41 and an air charging plug 43 communicated with the inner wall of the inner cavity 41, wherein the mixing shaft 42 is connected with a driving device 45 through a chain wheel 44.
The injection nozzle comprises a cavity 13, wherein one end of the cavity 13 is provided with a lever 81, an inner core 51, a needle valve 5 and a follow-up sleeve 52 are arranged in the cavity 13, the other end of the cavity 13 is provided with an injection nozzle 6, the needle valve 5 penetrates through the follow-up sleeve 52 and the inner hole of the injection nozzle 6, the injection nozzle 6 is fixed at the front end of the cavity 13 through threads, a first channel 1a is formed in a gap between the inner wall of the cavity 13 and the inner core 51, a second channel 1b is formed in the gap between the follow-up sleeve 5 and the inner core 51, the follow-up sleeve 52 is slidably connected with the front end of the needle valve 5, the follow-up sleeve 52 can slide at the inner hole of the inner core 51, a baffle 7 is arranged on the outer ring of the injection nozzle 6, the baffle 7 is fixed at the end of the main body 1, the inner ring of the baffle 7 is slidably connected with an overflow sleeve 71, the overflow sleeve 71 is tightly pressed against the end wall of the baffle 7 under the action of a spring 72, the end of the overflow sleeve 71 is provided with an opening, the injection nozzle 6 is positioned in the overflow sleeve 71 in the front end, the overflow sleeve 6 is in a normal state, the overflow sleeve is slidably connected with the outer ring 6, and the injection nozzle 6 is compressed by the spring 72, and the injection nozzle 6 is in contact with the opening. The main body 1 is further provided with a third channel 1c communicating with the overflow sleeve 71.
The reversing valve 3 has an inlet connected to the inlet on the flange 12 and two outlets connected to the mixer 4 and the other outlet connected to the first channel 1a, the mixer 4 being connected to the second channel 1 b.
The overflow recovery device 2 comprises a gun barrel 21 and a screw rod 22, the screw rod 22 is arranged in the gun barrel 21, the screw rod 22 is driven to rotate by a driving device 23, and the gun barrel 21 is communicated with the third channel 1 c.
The gun barrel 21 and the outer part of the body 1 are both provided with a heating device 8, and the heating device 8 is used for keeping the temperature in the body and the outer barrel and ensuring that the raw materials are in a melting state.
Referring to fig. 3, a micro-foaming injection molding method comprises the following steps of 1) a material storage step, wherein a heating device is heated to a set temperature before injection molding, and an injection molding machine is in a working state; the outlet of the reversing valve connected with the first channel is communicated, the other outlet is closed, and the mixer rotates at a set rotating speed; the needle valve power assembly drives the lever to transfer force to the hemispherical position at the rear end of the needle valve, so that the needle valve passes through the inner hole of the injection nozzle and props against the follower sleeve to the conical surface in the injection nozzle, and the needle valve is in a closed state.
Referring to fig. 4 and 2), after the storage of the injection molding machine is completed, the device integrally moves forward, the overflow sleeve is pressed against the mold 9, the spring is compressed, the nozzle extends out from the opening of the overflow sleeve and then abuts against the main gate 91 of the mold 9, and meanwhile, the nozzle is tightly contacted with the inner wall of the opening of the overflow sleeve to separate the inner cavity of the overflow sleeve from the main gate of the mold. The conventional fluid 10a (raw material not inflated) passes through the reversing valve and the first passage and then enters the nozzle, and then is ejected from the nozzle into the cavity of the mold. Meanwhile, the needle valve power assembly drives the lever to move backwards to a set displacement, the needle valve and the follow-up sleeve are pushed by the pressure of conventional fluid to move backwards, the second flow passage is closed, and the mixed fluid in the mixer is prevented from entering the die cavity.
Referring to fig. 5, 3), after the conventional fluid 10a is injected into the set mass, the reversing valve reverses direction. Injecting conventional fluid into the mixing area, pushing the homogenized mixed fluid to enter the second channel, continuously moving the needle valve power assembly driving lever backwards to a set displacement, continuously moving the valve core of the needle valve backwards under the pressure action of the mixed fluid, simultaneously pushing the follow-up sleeve forwards by the pressure of the mixed fluid, closing the first channel, and preventing the conventional fluid from entering the die cavity through the first channel. I.e. the second channel communicates with the gate of the mould, the mixed fluid 10b is injected inside the conventional fluid just inside the cavity until the whole cavity is filled. The conventional fluid forms the outer shell of the product, and the conventional fluid is not foamed, so that the outer shell of the product is not different from a common plastic product, the mixed fluid forms the inner core of the product, and the density of the inner core is lower than that of the conventional injection molding due to the existence of bubbles, so that the product finally achieves the effects of light weight and low cost.
Referring to fig. 6, 4), injection is terminated, and the needle valve power assembly drives the lever to move forward, pushing the needle valve and the follower sleeve to move forward to close the first channel and the second channel. The reversing valve is reversed until the outlet is communicated with the first channel, and the other outlet communicated with the mixer is in a closed state. The SCF nitrogen or carbon dioxide is injected into the mixer according to a set amount through the air filling plug, the mixer is driven to rotate through the driving device, and the mixed fluid filled with the SCF is mixed to be uniform.
Simultaneously, the injection molding machine injection table moves back to a set distance, the injection nozzle moves away from the main pouring gate of the mold, and the overflow sleeve is tightly pressed on the outer edge of the main pouring gate of the mold through a spring, so that the overflow channel is isolated from the external atmosphere. The mixed fluid which is not solidified at the core part of the product in the die cavity flows back into the overflow sleeve through the main gate due to the internal pressure of the product, then enters the inside of the third channel, and the overflowed mixed fluid is pumped out of the device through the rotation of the driven overflow screw. After the overflow recovery device is added, the material injected into the die can be extruded out of the device under the action of the internal pressure, so that the foaming rate of the inside of the product is greatly improved, the product is lighter, and the material is saved.
Claims (4)
1. The utility model provides a microbubble injection molding device with clout is retrieved, includes the main part, the main part communicates with each other with the die cavity of mould, its characterized in that: the overflow recovery device is characterized by further comprising a third channel arranged on the main body, the third channel is communicated with the cavity and the overflow recovery device, the third channel is generally in a closed state, after injection molding is completed, the third channel is opened, raw materials in the cavity enter the overflow recovery device through the third channel under the action of pressure and are discharged by the overflow recovery device to be recovered, one end of the main body is connected with a flange through a connector, a reversing valve, a mixer and a cavity are arranged in the main body, a needle valve is arranged in the cavity, a nozzle is arranged at the end part of the cavity, the nozzle is sleeved on the outer ring of the needle valve, the outer ring of the nozzle is contacted with the inner wall of the cavity, a valve core and a follow-up sleeve are arranged in the needle valve, a gap between the needle valve and the nozzle forms a first channel, the gap between the needle valve and the outer ring forms a second channel, the follow-up sleeve is slidably connected on the inner wall of the front end, the needle valve passes through the follow-up sleeve, the nozzle is provided with a spring, the nozzle is provided with an inlet and an inlet, the inlet is further connected with the inlet, the inlet is provided with the inlet is connected with the inlet, the inlet is provided with the inlet, the inlet is connected with the inlet, the inlet is provided with the inlet is normally, the outlet is connected with the inlet and the outlet, the inlet is provided with the inlet and the inlet is connected with the inlet, the other outlet is connected to the first passage and the mixer is connected to the second passage.
2. The microbubble injection molding device with residual material recovery as set forth in claim 1, wherein: the overflow recovery device comprises a gun barrel and a screw rod, the screw rod is arranged in the gun barrel, the screw rod is driven to rotate by the driving device, and the gun barrel is communicated with the third channel.
3. The microbubble injection molding device with residual material recovery as set forth in claim 2, wherein: and heating devices are arranged outside the gun barrel and the main body.
4. The microbubble injection molding device with residual material recovery as set forth in claim 1, wherein: the mixer comprises an inner cavity, a mixing shaft arranged in the inner cavity and an air charging plug communicated with the inner wall of the inner cavity, wherein the mixing shaft is connected with a driving device through a chain wheel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853571 | 2021-07-28 | ||
| CN202110853571X | 2021-07-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115519724A CN115519724A (en) | 2022-12-27 |
| CN115519724B true CN115519724B (en) | 2024-05-07 |
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ID=84696039
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210752712.3A Active CN115519724B (en) | 2021-07-28 | 2022-06-29 | Microbubble injection molding device with clout is retrieved |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115519724B (en) |
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| Publication number | Publication date |
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| CN115519724A (en) | 2022-12-27 |
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